Video Feature Connector Pinouts.

Pinout details

Pin	Name	Function
1	PD0	Dac Pixel data bit 0
2	PD1	bit 1
3	PD2	bit 2
4	PD3	bit 3
5	PD4	bit 4
6	PD5	bit 5
7	PD6	bit 6
8	PD7	bit 7
9	-	Dac Clock
10	-	Dac Blanking
11	-	Horizontal Sync
12	-	Vertical Sync
13	-	Ground
14	-	Ground
15	-	Ground
16	-	Ground
17	-	Select Internal Video
18	-	Select Internal Sync
19	-	Select Internal Dot Clock
20	-	Not Used
21	-	Ground
22	-	Ground
23	-	Ground
24	-	Ground
25	-	Not Used
26	-	Not Used

And I assume that pins 1 - 12 are outputs, and 17 - 19 are inputs. Is this correct?

The reason is this - I have a Rombo Media Pro+ video digitising card. It chroma keys its output into the vga monitor signal. However, although it is supposed to work with an ET-4000 with Hi-colour RAMDAC, the colours on screen behave as if the top 2 bits of colour information are missing, and red, green, blue signals are swapped around. Rombo has suggested that this may be due to insufficient buffering on the feature connector outputs, and is happy to sell me a buffer device for 50 pounds. I would rather save about 45 pounds, and build my own. I assume it would require (for example) a 74F244 buffer IC(or two).